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Reaction of α-Amidoalkylphenyl Sulfones with Lithiated Nitriles. syn-Selective Synthesis of β-Amino Nitriles
No full textReactivity of chiral alpha-amidoalkylphenyl sulfones with stabilized carbanions. Stereoselective synthesis of optically active 1-aminopyrrolizidine
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Synthesis of Secondary Amines by Reduction of alpha-Amidoalkylphenyl Sulfones with Sodium Acetoxyborohydride
No full textReaction of allylzinc reagents and zinc enolates of ketones with alpha-amidoalkylphenyl sulfones
No full textHighly Diastereoselective Addition of Nitromethane Anion to Chiral alpha-Amidoalkylphenyl Sulfones. Synthesis of Optically Active alpha-Amino Acid Derivatives
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Highly Diastereoselective Addition of Nitromethane Anion to Chiral alpha-Amidoalkylphenyl Sulfones
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Reaction of Allylzinc Reagents and Zinc Enolates of Ketones with α-Amidoalkylphenyl Sulfones
No full textα-Amidoalkylphenyl sulfones behave as N-acylimino equivalents in the reaction with functionalized allylzinc reagents. The addition products obtained using the zinc derivative of ethyl 2-(bromomethyl)-acrylate can be readily transformed into α-methylene-γ -lactams using different cyclization procedures. The allylzinc reagent obtained from 3-bromo-1-acetoxy-1-propene directly affords protected 1,2-amino alcohols with a preference for the anti stereoisomer, regardless of the structure of the α-amidoalkylphenyl sulfone employed. This procedure can be extended to the use of zinc enolates obtained from α-bromo ketones and leads to the synthesis of N-protected β-amino ketones
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